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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended	138 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Jun. 30, 2019
Activity in treasury stock
Balance at the beginning of the period			$ 3,019.6
Purchase of shares						$ 2,900.0
Balance at the end of the period	$ 3,032.4	$ 3,009.1	$ 3,032.4	$ 3,009.1	$ 3,019.6	$ 3,032.4
Southern Copper common shares
Activity in treasury stock
Treasury stock balance at the end of the period (in shares)	111,537,217	111,567,617	111,537,217	111,567,617		111,537,217
Southern Copper common shares | Directors' Stock Award Plan
Share Based Compensation Plan, share distributions
Share Based Compensation Plan, share distributions during the period			14,400,000,000		16,000,000,000
Parent Company (Grupo Mexico) common shares | Employee Stock Purchase Plan
Share Based Compensation Plan, share distributions
Share Based Compensation Plan, share distributions during the period			400,000		1,300,000
TREASURY STOCK: | Southern Copper common shares
Activity in treasury stock
Balance at the beginning of the period			$ 2,768.3	$ 2,768.7	$ 2,768.7
Used for corporate purposes	$ (0.4)	$ (0.4)	(0.4)	(0.4)
Balance at the end of the period	2,767.9	2,768.3	2,767.9	2,768.3	2,768.3	$ 2,767.9
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares
Activity in treasury stock
Balance at the beginning of the period			251.3	232.4	232.4
Other activity, including dividend, interest and foreign currency transaction effect			13.2	8.4
Balance at the end of the period	$ 264.5	$ 240.8	$ 264.5	$ 240.8	$ 251.3	$ 264.5

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